Firearm holster



FIG. 1 is an upper perspective view of a firearm holster;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is a second side view thereof; and,

FIG. 6 is a top view thereof.

In the figures, the broken lines are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a firearm holster, as shown and described. 